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Big Roof Britain Solar Payback Index Standing Charge Drag

Solar Panels in LL44 (Gwynedd)

See if solar pays off for you in Gwynedd — price, savings and payback in under a minute (official UK data).

Solar Calculator

Change the settings below to see how costs and savings work for your situation.

System Size

Roof Direction

Battery Storage

Export Value

Your Numbers

Break-even
13.6 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£897
What you save every year
Profit Over 25 Years
£10,222
After paying itself off, you're this much ahead

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How we calculate this

Solar generation: Based on typical south-facing roof at 35° angle. We account for weather, dirt, and system losses (14%).

How much you'll use directly:

  • Without battery: You'll use about 40% of what you generate. The rest gets sold back to the grid.
  • With 5 kWh battery: You'll use about 70% (battery stores extra for evening use).
  • With 10 kWh battery: You'll use about 75% (more storage means less exported).
  • Panel-only payback: Bigger systems don’t shorten payback—cost and savings rise together per kW.
  • Battery & payback: Batteries raise self-use and cut bills, but added hardware cost often lengthens break-even at typical UK rates.
  • When a battery can still make sense:
    • Evening-heavy usage patterns
    • Time-of-use tariffs / cheap night rates
    • Low export rate vs. high unit rate
    • Heat pump or EV charging synergy
    • Optional backup/resilience (system-dependent)
    • Lower evening-hour CO₂ vs. grid

Costs: Battery prices are typically £700 per kWh. Export tariffs vary by supplier (usually 5–15p per kWh).

Grid connection: Systems up to about 3.7 kW typically need just a notification (G98). Larger systems may need permission (G99).

These are typical values based on average usage patterns. Your actual results will vary based on your roof, shading, and how you use electricity.

Your area in context

In North Wales and Mersey, the current unit rate is 27.72p/kWh with a 69.95p/day standing charge. Your postcode’s south-facing sunshine yield is 875 kWh/kW — 55 below the regional median (930).

Read the full story

A typical roof here lands around 6.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 875 kWh per year on a south-facing roof. We value self-used electricity at 27.7p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
27.7p/kWh
Standing charge
70.0p/day
Sunshine yield (south)
875 kWh/kW
Export price (baseline)
10p/kWh

Browse the scenarios below. Each battery size has its own expand — open the one that matches your plan (or just explore). For each system size (2–8 kW) we show annual output, how much you use directly, what gets exported, annual benefit, upfront cost, break-even, and a 20-year net. Negative numbers are possible — that’s the honest trade-off when adding more battery than your usage profile justifies.

No battery 5 kW example → Annual benefit: £748, Upfront: £10,173, Break-even: 13.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1750 kWh 700 kWh 1050 kWh £194 £105 £299 £4,069 13.6 yrs £1,912
3 kW 2625 kWh 1050 kWh 1575 kWh £291 £158 £449 £6,104 13.6 yrs £2,868
4 kW 3500 kWh 1400 kWh 2100 kWh £388 £210 £598 £8,138 13.6 yrs £3,824
5 kW 4375 kWh 1750 kWh 2625 kWh £485 £263 £748 £10,173 13.6 yrs £4,780
6 kW 5250 kWh 2100 kWh 3150 kWh £582 £315 £897 £12,207 13.6 yrs £5,736
7 kW 6125 kWh 2450 kWh 3675 kWh £679 £368 £1,047 £14,242 13.6 yrs £6,692
8 kW 7000 kWh 2800 kWh 4200 kWh £776 £420 £1,196 £16,276 13.6 yrs £7,648

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £903, Upfront: £12,273, Break-even: 13.6 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1750 kWh 1050 kWh 700 kWh £291 £70 £361 £6,169 17.1 yrs £1,053
3 kW 2625 kWh 1575 kWh 1050 kWh £437 £105 £542 £8,204 15.1 yrs £2,629
4 kW 3500 kWh 2100 kWh 1400 kWh £582 £140 £722 £10,238 14.2 yrs £4,205
5 kW 4375 kWh 2625 kWh 1750 kWh £728 £175 £903 £12,273 13.6 yrs £5,781
6 kW 5250 kWh 3150 kWh 2100 kWh £873 £210 £1,083 £14,307 13.2 yrs £7,358
7 kW 6125 kWh 3675 kWh 2450 kWh £1,019 £245 £1,264 £16,342 12.9 yrs £8,934
8 kW 7000 kWh 4200 kWh 2800 kWh £1,164 £280 £1,444 £18,376 12.7 yrs £10,510

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £980, Upfront: £13,673, Break-even: 13.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1750 kWh 1225 kWh 525 kWh £340 £53 £392 £7,569 19.3 yrs £273
3 kW 2625 kWh 1838 kWh 788 kWh £509 £79 £588 £9,604 16.3 yrs £2,159
4 kW 3500 kWh 2450 kWh 1050 kWh £679 £105 £784 £11,638 14.8 yrs £4,045
5 kW 4375 kWh 3063 kWh 1313 kWh £849 £131 £980 £13,673 13.9 yrs £5,932
6 kW 5250 kWh 3675 kWh 1575 kWh £1,019 £158 £1,176 £15,707 13.4 yrs £7,818
7 kW 6125 kWh 4288 kWh 1838 kWh £1,189 £184 £1,372 £17,742 12.9 yrs £9,705
8 kW 7000 kWh 4900 kWh 2100 kWh £1,358 £210 £1,568 £19,776 12.6 yrs £11,591

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,003, Upfront: £15,423, Break-even: 15.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1750 kWh 1278 kWh 473 kWh £354 £47 £401 £9,319 23.2 yrs £-1,291
3 kW 2625 kWh 1916 kWh 709 kWh £531 £71 £602 £11,354 18.9 yrs £688
4 kW 3500 kWh 2555 kWh 945 kWh £708 £95 £803 £13,388 16.7 yrs £2,668
5 kW 4375 kWh 3194 kWh 1181 kWh £885 £118 £1,003 £15,423 15.4 yrs £4,647
6 kW 5250 kWh 3833 kWh 1418 kWh £1,062 £142 £1,204 £17,457 14.5 yrs £6,626
7 kW 6125 kWh 4471 kWh 1654 kWh £1,239 £165 £1,405 £19,492 13.9 yrs £8,606
8 kW 7000 kWh 5110 kWh 1890 kWh £1,417 £189 £1,606 £21,526 13.4 yrs £10,585

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,019, Upfront: £17,173, Break-even: 16.9 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1750 kWh 1313 kWh 438 kWh £364 £44 £408 £11,069 27.2 yrs £-2,917
3 kW 2625 kWh 1969 kWh 656 kWh £546 £66 £611 £13,104 21.4 yrs £-876
4 kW 3500 kWh 2625 kWh 875 kWh £728 £88 £815 £15,138 18.6 yrs £1,166
5 kW 4375 kWh 3281 kWh 1094 kWh £910 £109 £1,019 £17,173 16.9 yrs £3,207
6 kW 5250 kWh 3938 kWh 1313 kWh £1,092 £131 £1,223 £19,207 15.7 yrs £5,249
7 kW 6125 kWh 4594 kWh 1531 kWh £1,273 £153 £1,427 £21,242 14.9 yrs £7,290
8 kW 7000 kWh 5250 kWh 1750 kWh £1,455 £175 £1,630 £23,276 14.3 yrs £9,331

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,034, Upfront: £19,623, Break-even: 19.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1750 kWh 1348 kWh 403 kWh £374 £40 £414 £13,519 32.7 yrs £-5,243
3 kW 2625 kWh 2021 kWh 604 kWh £560 £60 £621 £15,554 25.1 yrs £-3,140
4 kW 3500 kWh 2695 kWh 805 kWh £747 £81 £828 £17,588 21.3 yrs £-1,036
5 kW 4375 kWh 3369 kWh 1006 kWh £934 £101 £1,034 £19,623 19.0 yrs £1,067
6 kW 5250 kWh 4043 kWh 1208 kWh £1,121 £121 £1,241 £21,657 17.4 yrs £3,171
7 kW 6125 kWh 4716 kWh 1409 kWh £1,307 £141 £1,448 £23,692 16.4 yrs £5,274
8 kW 7000 kWh 5390 kWh 1610 kWh £1,494 £161 £1,655 £25,726 15.5 yrs £7,378

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

Figures are illustrative and use the same method as the calculator above. For exact results, adjust your roof direction, tariff, and usage in the calculator.

Insights for LL44

Figures below are tailored to LL44 — click through for full league tables.

Big-Roof Britain Rank #190 of 2182
6.2 kWp (UK avg 5.1 kWp)
~13 panels (≈430 W)
Solar Payback Index Rank #2120 of 2997
11.8 years (UK avg 11.3 years)
~£1,037 /yr • £12,207 upfront
Standing-Charge Drag Rank #2175 of 2997
24.6% (UK avg 21.7%) drag on savings
£255 fixed • ~£1,037 /yr value

Your Area at a Glance

Your Electricity Rate
27.72p/kWh
Daily Fixed Charge
69.95p/day
Local Sunshine
875kWh/kW
A 1 kW system generates ~875 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
6.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 58% • Flats: 5% • Bungalows: 37% Based on 324 properties

Coverage

Gwynedd (100%)

Areas Covered

Dyffryn Ardudwy, Abermaw

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q4 2025

Installation costs: MCS certified installer data, March 2025

Property data: EPC open data (Open Government Licence), aggregated

All estimates are typical values. Actual results vary based on your specific situation, roof characteristics, and usage patterns.

Compare nearby areas

Nearby in North Wales and Mersey

LL43 (Gwynedd)
≈1.6 km away
Local sunshine: ~875 kWh/kWp · -0% vs LL44
LL45 (Gwynedd)
≈3.4 km away
Local sunshine: ~835 kWh/kWp · -5% vs LL44
LL46 (Gwynedd)
≈7.7 km away
Local sunshine: ~830 kWh/kWp · -5% vs LL44
LL42 (Gwynedd)
≈7.7 km away
Local sunshine: ~864 kWh/kWp · -1% vs LL44
LL39 (Gwynedd)
≈10.5 km away
Local sunshine: ~825 kWh/kWp · -6% vs LL44
LL38 (Gwynedd)
≈10.8 km away
Local sunshine: ~846 kWh/kWp · -3% vs LL44

Similar sunshine across the UK

HX7 (Calderdale)
~875 kWh/kWp · +0% vs LL44
M50 (Salford)
~875 kWh/kWp · -0% vs LL44
M30 (Salford)
~875 kWh/kWp · -0% vs LL44